Bladder Stones in Cats: Types, Symptoms & Treatment
- Bladder stones are hard mineral collections in the bladder that can irritate the lining, cause blood in the urine, and sometimes block urine flow.
- The two main stone types in cats are struvite and calcium oxalate. The type matters because treatment options are different.
- Some confirmed struvite stones can be dissolved with a prescription urinary diet and close rechecks, but calcium oxalate stones usually need physical removal.
- A cat that is straining and producing little or no urine needs urgent veterinary care right away, especially if male.
- Typical US cost ranges run from about $400-$1,200 for exam, testing, and medical management of dissolvable stones, and about $1,500-$4,500+ if anesthesia, hospitalization, or surgery is needed.
What Are Bladder Stones in Cats?
Bladder stones, also called uroliths or calculi, are hard mineral deposits that form inside the bladder. They develop when minerals in urine become concentrated enough to form crystals, and those crystals stick together over time. Some stones stay tiny, while others grow large enough to irritate the bladder wall or move into the urethra.
In cats, the most common bladder stone types are struvite and calcium oxalate. Calcium oxalate stones are now very common in cats, and many veterinary references list them among the most frequent feline urinary stones. The exact stone type matters because treatment is not one-size-fits-all.
That difference is important for pet parents. Struvite stones may sometimes be dissolved with a prescription diet if your cat is stable and your vet believes the stones are likely struvite. Calcium oxalate stones cannot be dissolved with diet and usually need to be removed by surgery or another procedure your vet recommends.
Bladder stones can also look a lot like other lower urinary tract problems, including feline idiopathic cystitis and urethral plugs. That is why imaging and urinalysis matter. Similar symptoms do not always mean the same condition.
Symptoms of Bladder Stones in Cats
- Straining to urinate or repeated trips to the litter box with only small amounts produced
- Blood-tinged urine or pink spots in the litter
- Painful urination, crying, or tense body posture while trying to urinate
- Urinating outside the litter box because the bladder feels irritated
- Frequent licking of the genital area
- Passing only drops of urine or no urine at all
- Lethargy, hiding, vomiting, or poor appetite if pain is severe or a blockage develops
See your vet immediately if your cat is straining and not producing urine, seems painful, is vomiting, or suddenly becomes weak or collapsed. Male cats are at higher risk of a life-threatening urethral blockage because their urethra is narrower. Even when some urine is still coming out, frequent straining, blood in the urine, or accidents outside the litter box deserve prompt evaluation because bladder stones, plugs, and cystitis can look very similar at home.
What Causes Bladder Stones in Cats?
Bladder stones form when urine chemistry allows minerals to precipitate into crystals and then grow. Several factors can contribute, including urine concentration, urine pH, diet, water intake, body condition, age, and individual metabolic tendencies. In plain terms, concentrated urine gives minerals more opportunity to clump together.
Struvite stones are made of magnesium, ammonium, and phosphate. They tend to form in urine that is less acidic, and in cats they are often sterile, meaning they are not necessarily caused by a urinary tract infection. That is different from dogs, where infection-related struvite is more common.
Calcium oxalate stones tend to occur more often in middle-aged to older cats and are commonly associated with more acidic urine. They are seen more often in males and in certain breeds, including Burmese, Himalayan, Persian, and Siamese cats. Some cats with calcium oxalate stones also have high calcium levels in the blood or urine, but not all do.
Low water intake is a practical risk factor pet parents can work on with your vet. Cats naturally have a low thirst drive, so dry diets, limited water access, or a preference against still water can all contribute to concentrated urine. That does not mean one food caused the problem by itself, but hydration is a major part of prevention.
How Are Bladder Stones Diagnosed?
Your vet will usually start with a physical exam and urinalysis. A urinalysis can show blood, inflammation, urine concentration, pH, and sometimes crystals. Still, crystals alone do not prove that stones are present, and some cats with stones do not have obvious crystals in the sample.
Imaging is what confirms the diagnosis. Radiographs (X-rays) are commonly used because many bladder stones are visible on them. Ultrasound can help when stones are small, when the bladder wall also needs evaluation, or when your vet wants a closer look at the kidneys and ureters.
Many cats also benefit from blood work, especially if they are blocked, dehydrated, older, or may need anesthesia. Blood tests help your vet check kidney values, electrolytes, and calcium levels. If infection is suspected, your vet may recommend a urine culture rather than assuming antibiotics are needed.
If stones are removed or passed, they should be submitted for quantitative stone analysis. That result helps guide prevention because a diet that helps prevent one stone type may not be appropriate for another.
Treatment Options for Bladder Stones in Cats
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Conservative Care
- Office exam and abdominal palpation
- Urinalysis, with urine culture if your vet suspects infection
- X-rays or ultrasound to confirm stones and estimate size and number
- Prescription dissolution diet when stones are strongly suspected or confirmed to be struvite
- Hydration plan such as canned food, added water to meals, and multiple water stations
- Pain relief and anti-nausea support if your vet feels they are appropriate
- Repeat imaging every 2-6 weeks to confirm stones are shrinking
Standard Care
- Exam, urinalysis, blood work, and diagnostic imaging
- Anesthesia and cystotomy to remove stones from the bladder
- Hospitalization for perioperative monitoring
- Pain control and supportive care during recovery
- Stone analysis after removal
- Prescription prevention diet based on stone type
- Recheck urinalysis and follow-up imaging after recovery
Advanced Care
- Emergency stabilization for urethral obstruction
- Urinary catheter placement and bladder decompression
- IV fluids, electrolyte correction, and hospitalization
- Advanced imaging or referral-level evaluation for recurrent or complicated stones
- Cystotomy or other removal procedure recommended by your vet or specialist
- Metabolic workup for recurrent calcium oxalate stone formers, including calcium assessment
- Long-term monitoring plan with repeat urinalysis, culture when indicated, and imaging
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Bladder Stones
Bring these questions to your vet appointment to get the most out of your visit.
- Based on the imaging and urine results, which stone type is most likely in my cat? Treatment choices depend heavily on whether the stones are likely struvite, calcium oxalate, or something less common.
- Is my cat a candidate for dietary dissolution, or do you recommend removing the stones now? This helps you understand whether conservative care is reasonable or whether a procedure is safer.
- Do you recommend a urine culture before starting antibiotics? Not every cat with urinary signs has a bacterial infection, and culture can help avoid unnecessary medication.
- What signs would mean this has become an emergency at home? Knowing when to seek immediate care is especially important for male cats at risk of blockage.
- If stones are removed, can they be sent for quantitative analysis? Stone analysis helps your vet choose the most appropriate prevention plan.
- What prevention diet do you recommend for my cat's stone type, age, and other health needs? Urinary diets are not interchangeable, and the best choice depends on the specific stone and the whole cat.
- How often should we repeat urinalysis or imaging after treatment? Rechecks help catch recurrence early, before symptoms become severe.
- What practical steps can we use at home to increase water intake? Hydration is one of the most helpful long-term tools for reducing recurrence risk.
How to Prevent Bladder Stones in Cats
Prevention usually focuses on making urine more dilute and matching the diet to the stone type. Many cats benefit from eating more canned food, having water added to meals, and using several water bowls or a fountain. Small changes in hydration can make a meaningful difference over time.
If your cat has had stones before, your vet may recommend a prescription urinary diet. These diets are formulated to influence urine mineral content and pH in a controlled way. They are not all the same, so the right diet for struvite prevention may not be the right one for calcium oxalate prevention.
Follow-up matters. Your vet may suggest repeat urinalysis, urine culture when indicated, and periodic X-rays or ultrasound, especially during the first year after treatment. Cats that have formed stones once are at risk of forming them again, so prevention is usually an ongoing plan rather than a one-time fix.
At home, watch for subtle changes. More litter box trips, urine spots outside the box, pink urine, or vocalizing while urinating can all be early clues that your cat needs a recheck.